20 August 2008

Gastric bypass surgery is a form of weight reduction surgery that is more extensive than gastric banding, and therefore tends to be better suited to patients who have more weight to lose.

Gastric bypass surgery makes the stomach smaller and allows food to bypass part of the small intestine. You will feel full more quickly than when your stomach was its original size, whichless food can be eaten comfortably and thus the calories consumed. Bypassing part of the intestine also results in fewer calories are absorbed. This leads to weight loss.

In normal digestion, food passes through the stomach and enters the small intestine, where most of the nutrients and calories are absorbed. It then passes into the large intestine (colon), and the remaining waste is eventually excreted.

In a Roux-en-Y gastric bypass, the stomach is made smaller by creating a small pouch at the top of the stomach using surgical staples or a plastic band. The smaller stomach is connected directly to the middle portion of the small intestine (jejunum), bypassing the rest of the stomach and the upper portion of the small intestine (duodenum).

This procedure can be done by making a large incision in the abdomen (an open procedure) or by making a small incision and using small instruments and a camera to guide the surgery (laparoscopic approach).

Like the gastric band, this procedure tends to be carried out using keyhole surgery but involves 4-5 nights in hospital. It can also be carried out by normal surgery for people who are very obese where keyhole surgery may not be suitable.
The Types of gastric bypass surgery

Though there are a number of variations, two of the most commonly performed bypass procedures are the Roux-en-Y gastric bypass (RGB) and Biliopancreatic Diversion (BPD). These - and their variations - can be performed as either open or closed (keyhole) procedures.

Roux-en-Y gastric Bypass (RGB)
Roux-en-Y gastric bypass (RGB) – This operation is the most common gastric bypass procedure performed. First, a small stomach pouch is created by stapling part of the stomach together or by vertical banding. This limits how much food you can eat. Next, a Y-shaped section of the small intestine is attached to the pouch to allow food to bypass the duodenum as well as the first portion of the jejunum. This causes malabsorbtion (decreased ability to absorb calories and nutrients from food)


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